expository prewrite

When I first started thinking about this expository essay, I had a couple of ideas on my hands.I had an idea about a best friend, an idea about a holiday a while back, and a few other things. the one i chose, however, is a vacation i took with my family back when i was in the 10th grade. Im still a bit stuck on the detils of what questions I'm going to ask myself for this, but a couple rough ideas I have are what activities we took part in while on our trip, what I believe i thought at the time of some of the more important parts, and im still trying to figure out what it was i was supposed to have figured out on the trip. Im sure if i think about it, do some serious brainstorming and explore my brain a little bit, ill get some very good ideas.